Talking-machine.



oEEIoE.

ANDREW HAUG, 0F NEW YORK, N. Y.

TALKING-MACHINE.

specification m Letters Patent'.

Patented Oct. 15, 1918.

Application led May 21, 1918. Serial 1i o. 235,906.-

To all whom it may concern:

Be it known that I, ANDREW HAUG, a citi zen of the United States of America, resid ing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Talk ing-Machines, of which the following is a specification.

My invention relates generally to talking machines and has particular reference to the construction of soundboxes for use in connection with such machines.

The primaryxobject of the invention is to obtain better tone quality of the reproduced sound by constructing the sound-box in a manner to give it freer action and greater sensitiveness, thereby rendering it more fully responsive, particularly to the finer vibrations of the record, which are ordinarily damped out and lost in the use of soundboxes now on the market, as a result of frictional resistance and pressure on the moving parts thereof.

I have found by experiment and test that greatlyimproved results are obtained in tone quality, when the diaphragm and stylus arm of the sourflb0X are operatively connected in such relationlthat normally or when the soundbox is not in use, no pull or pressure is exerted by the stylus arm on the dia phragin and the latter, excepting its usual circumferential mounting, is entirely free of tension.

A second important feature of the invention consists in mounting the stylus arm so that it will be firmly held against lost mo tion or rattling and at the same ti me, free to vibrate with the least possible amount of friction.

In connection with the peculiar mounting of the stylus arm, an additional and even more important feature of the invention consists in the provision of means for varying the pressure between the pivotal centers on which the stylus arm turns, to tune the sound-box. That is to say, by increasing thepressure, the pitch of the box is raised and on reducing the pressure, the pitch is lowered. The important resulting advan-A tages will be apparent.

A clearer understanding of the above and other novel features of the invention may be had from the following detailed descrlptiont In the accompanying drawings, I have illustrated several constructions suitable for carrying my invention into effect. I wish it understood, however, that I do not'limit myself to the exact forms shown inthe drawings, as various changes may be made therein without departing from the spirit and scope of .the invention.

In these drawings: A

Figure 1 is a face view of the sound-box.'

Fig. 2 is a sectional view taken horizontally through the pivotal centers on which the stylus arm vibrates.

Fig. 3 is a similar View of a slightly modified form, and

F'g. 4 is a detail view of the spring disk shown in Fig. 2.

Referring now to the-drawings, 1 represents the casing of the sound-box and 2 the diaphragm mounted therein in any suitable or well-known manner, preferably by being yieldingly held circumferentially between rubber gaskets, (not shown), as` iscommonly done in the art.

Projecting outward in parallel relation' from the casing 1, there are two lugs 3, 3, in which the stylus arm 4 is trunnioned, as indicated at 5.

The trunnions are formed by the oppo sitely projecting ends 6, 6, ofr a hardened steel pin 7, which is driven transversely through or otherwise made fast to the stylus arm to form, in effect, an integral part of it.

Bearings 6, 6, for the trunnions are provided by boring out the lugs 3, 3, as shown. Either or both of these bearings may have a removable bushing 8, fitted therein to facilitate assembling, it Ybeing necessary, in placing the stylus arm in-position between the lugs, to first insert one trunnion and the' adjoining boss 9 of the arm in the bore of one lug before the bushing is placed therein, in order to enter the other trunnion in the opposite bearing. The arm is then centered and the bushing or bushings inserted. i

Only one bearing is usually bashed, this being found sufficient to enable the stylus arm to be readily mounted in the bearings.

The bushing is provided with an integral terminal flange 10, which rests against the annular end wall of a counter-bored portion 11 of the lug, as shown.

Cooperating with the flat orvplane surface presented by the ends of the trunnions,

alents, indicated at 12, which come to a bearing axially of the trunnions and exactly in the line of centers about which thestylus arm vibrates.

y means of one or more fine threaded screws 13, in the outer tapped portions of the bore of the lugs, I am enabled to force the balls inward and thereby exert the necessary pressure on the arm to tension it as required for the purpose of tuning thesound-box.

It isimportoant to note that by reason of the peculiar manner in which such pressure is applied, that is to say, axially of the vibrating center ofthe arm, there will be no appreeiable resulting friction tending to limit or check the ifreevibr'atinar movement of the arm. Having overcome the retarding eflect of friction in the manner stated, it will be seen that there are practically no limits to the pressure that may be applied to tension t'he arm, and that therefore the tuning of the sound-box to give best results is reduced to the.simple adjustment of the pressure screws to vary the tension of the stylus arm.

When the sound-box is not subjected to changes in temperature, the form of the device shown in Fig. 3 Will ordinarily operate satisfactorily, once the sound-box is tuned. In this construction, it will be observed that the pressure-regulating screws are rounded at the ends, as indicated at 12, approximating a Lportion of a sphere and that such.

rounde portions bear directly against the trunnions of the stylus arm, thus serving., when properly adjusted, to maintain the arm under the required tension. Under marked changes in temperature, as willv be obvious, the expansionand contraction of Cil the metal is often suiicient to destroy the ,adjustment and so vary thepressure andA tension of the stylus arm as to require a frequent re-tuning ofthe box.

In'order to adapt the sound-box for general use regardless of changes in tempera ture, the form shown in Figure 2 l may be employed, in which a tension disk 14, is iny terposed in the line of applied pressure and by its resilience serves -to compensate for any and all expansion and contraction of the metallic members.

The tension disk 14 ispreferably given a roncaved form and is split radiallyto about one-third of its diameter at a number of points about its circumference, as indicated at 15. As shown, it is interposed between the pressure screw 13 and the adjoining ballbearing 12, the convex side f the disk coacti'ng directly with the balk In this construction only one pressure-rcgulating screw 13 is employed and is secured, as adjusted, 'by a locking-screw 13, the opposite trunnion and ball beinglitted in a socket 16 formed in theothcr lug ot' the sound-box casing. i As the many important advantages of the invention will be apparent from the forego.- ing description, it will not be necessary to specifically mention or further elaborate the same.

.Havingg therefore, described. my inventlon, I -claim;l` ,l

1. In a sound box, a stylus arm having bearing extensions on each side thereof, bearmg lugs receiving and holding the bearing extensions for pivotal movement, coperating ball bearings applied to opposite sides of the bearing extensions of the arm and axially thereof in the line of centers about which the arm vibrates, and controllable means exerting pressure on the balls to vary the tension of the arm.`

2. In a sound box, a stylus arm having bearlng extensions on each side thereof, bear- 1ng lugs receiving and holding the bearing extenslons for pivotal movement, coperating ball bearings applied to opposite sides of the bearing extensions of the arm and axially thereof in the line of centers about which the arm vibrates, and adjustable means exerting yielding pressure on the balls to vary the tension of the arm.

.In a sound box, a stylus arm having bearing extensions on each side thereof, bearing lugs receiving and holding the bearing extensions for pivotal movement, a dia-I phragm normally free of tension and. operatively connected with the arm, coperating ball bearings applied to opposite sides of the bearing extensions of the arm and axially thereof in the line of centers about which the arm v1brates,and controllable means exerting lressure on the balls to vary the tension of t e arm.

4. In a sound box, a stylus arm havin bearing extensions on each side thereof, bearing lugs receiving and holding the bearing extensions for pivotal movement, coperatingjiall bearings applied to opposite sides of the bearing extensions of the arm and axi ally thereoi'l in the line of centers aboutwhich the arm vibrates, a spring exerting pressure on the balls to tension the arm, and means controlling the pressure of the spring.

5. A sound box, comprisin a casing provided with bearing lugs, a sty us arm havin bearing extensions on each side thereof, sai hear-iupV extensions being held by said lugs and serving as a pivot about which the arm vibrates, a. diaphragm mounted in the sound box casing, said diaphragm beingr free of tension at its center and operatively connected \vith-;tl1e stylu's arm, and tuning 120 means for thc sound box consistin of ballbearings applied to opposite sides o the bearing extensions and axially thereof in the line ot' centers about which the arm vibrates, and coiperating means exerting requisite pressure on the balls to tension the stylus arm.

6. A sound box comprising a easin provided with integral lugs, a diap ragm mounted in the easing, a stylus arm having extensions on each side thm-enf mld being operatively eonnected but normally exerting no pressure on the dubragm, the said lugs of the casin beng a ,ptd t0 1L-emma und hold the sai Vbearmg extensiolm im p'fmml mvememu of the amil., and' tuning means 'for the suund box consistin of bail bearings my plid axially to the p une sux-Mas Lion-ned by the o )posite ends of the bemitlm @smell-1 `slums an... pressure regulating :ummm mp @rating with the balls to vary the mnsma" of the Stylus arm.

'L n sound box, n smiling amm haw-img;

l malla-fl surfaces formed by the opp0 im thermfy mpmaltmg bearmgs pre,- smltmg lrwunded smfnms, wach, approxlmat ing @L pmirmmm mi sphere to the plane suru imm@ mnd adgusmbe, means c0- llrmw im. opalgfmm Wt'l the beinrngfi tvo exrt, pressure on tm mlrrm. m wry the m1151011 thereof, such pressum be mg 

